National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Risks of Severe Thunderstorms and Excessive Rainfall; Fire Weather Concerns and Record Warmth

Severe thunderstorms and flash flooding risks increase across the center of the nation today. Meanwhile, ongoing thunderstorms and flash flooding will linger along the Gulf Coast states through the evening. The Great Basin and Intermountain West, warm temperatures and dry fuels with dry lightning may enhance fire weather potential. In addition, across interior Alaska, Red Flag Warning are posted. Read More >

Current conditions at

LOS ALTOS (LOAC1)

Lat: 37.35472°NLon: 122.14167°WElev: 539.0ft.

NA

75°F

24°C

Humidity 48%
Wind Speed WNW 4 MPH
Barometer NA
Dewpoint 54°F (12°C)
Visibility NA
Last update 20 Jun 04:10 PM PDT
Extended Forecast for

Portola Valley CA

  • Tonight

    Tonight: Increasing clouds, with a low around 52. West southwest wind 5 to 7 mph becoming calm in the evening.

    Low: 52 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 79. Calm wind becoming west southwest around 6 mph in the afternoon.

    High: 79 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 52. Light west southwest wind.

    Low: 52 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 82. Calm wind becoming west around 5 mph in the afternoon.

    High: 82 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. West wind around 5 mph becoming calm in the evening.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 55.

    Low: 55 °F

    Clear then
    Patchy Fog

  • Wednesday

    Wednesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 55.

    Low: 55 °F

    Clear then
    Patchy Fog

Detailed Forecast

Tonight
Increasing clouds, with a low around 52. West southwest wind 5 to 7 mph becoming calm in the evening.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 79. Calm wind becoming west southwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 52. Light west southwest wind.
Monday
Sunny, with a high near 82. Calm wind becoming west around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 54. West wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Patchy fog after 4am. Otherwise, mostly clear, with a low around 55.
Wednesday
Sunny, with a high near 85.
Wednesday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 55.
Thursday
Sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 54.
Friday
Sunny, with a high near 78.
Friday Night
Mostly clear, with a low around 54.
Saturday
Mostly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portola Valley CA
 37.39°N 122.23°W (Elev. 397 ft)
Last Update:
1:26 pm PDT Jun 20, 2026
Forecast Valid:
4pm PDT Jun 20, 2026-6pm PDT Jun 27, 2026
 
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Additional Resources

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